The wind strength & direction unit - 5 or 6 metres up off the ground on a mast mounted up the chimney on Brian's house - appears to have dead batteries.

Brian can't get up there at the mo due to damaging the cartilage in his knee. I had a go on Sunday, but bottled-out extending the ladder beyond what I thought was its safe limit, so couldn't reach the top U bolt. Anyone have a scaffold tower handy?